Hey TC,
By travel pass... do you mean flying at a reduced fare??
In our company we, as staff, can fly with tickets at 4, 10 or 50 percent of the actual ticket prize without the tax. 4 and 10 percent are "stand by" and the 50 percent is with a "reserved" seat.
And afterwards they add the normal airport taxes that every pax has to pay ...
Example: If a flight from A to B costs 125 (100 for the ticket and 25 for tax) and I decide to take a 10 percent ticket I will pay 35! (10 + 25)
This is how it works at our company! I don't know if it counts as a general rule!
Greeting,
Many happy landings!